for those seeking to buy superior-grade stainless & duplex steel flanges, we are the best suppliers of it in the market. We are open to receiving payment online as well as through traditional payment methods. Our terms and conditions for payment are transparent and we advise patrons to abide by them. grades : 15 nb up to 600 nb in 150 lbs, 300 lbs, 400 lbs, 600 lbs, 900 lbs, 1500 lbs, 2500 lbs table 2.5, table 6, table 10, table 16, table 25, table 40, table 64, table 160, table 320, table 400 form : slip on, socket weld, blind, lapped, screwed, weld neck, reducing, spectacle, slip on boss, plate, plate blank, screwed boss. stainless steel : astm asme sa 182 f 304, 304l, 304h, 309h, 310h, 316, 316h, 316l, 316 ln, 317, 317l, 321, 321h, 347h. duplex steel : astm asme sa 182 f 44, f 45, f51, f 53, f 55, f 60, f 61.